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Merged
merged 9 commits into from
Dec 5, 2023
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Unquoted literals as name or number #553

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f9c7b54
Unquoted literals as name or number
aphillips Dec 4, 2023
b497ce3
Update syntax.md
aphillips Dec 4, 2023
01113f4
Update syntax.md
aphillips Dec 4, 2023
b230b3f
Update spec/message.abnf
aphillips Dec 4, 2023
b149aad
Update spec/syntax.md
aphillips Dec 4, 2023
757c77b
Fix the dangling sentence about function names
aphillips Dec 4, 2023
d9e512f
Update spec/message.abnf
aphillips Dec 4, 2023
4574184
Update spec/syntax.md
aphillips Dec 4, 2023
1ec5605
Update spec/syntax.md
aphillips Dec 4, 2023
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8 changes: 5 additions & 3 deletions spec/message.abnf
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Original file line number Diff line number Diff line change
Expand Up @@ -50,9 +50,11 @@ quoted-char = %x0-5B ; omit \
/ %x7D-D7FF ; omit surrogates
/ %xE000-10FFFF

unquoted = unquoted-start *(name-char / ":")
unquoted-start = name-start / DIGIT / "."
/ %xB7 / %x300-36F / %x203F-2040
unquoted = name
/ number-literal
; number-literal matches JSON number
; https://www.rfc-editor.org/rfc/rfc8259#section-6
number-literal = ["-"] (0 / ([1-9] *DIGIT)) ["." 1*DIGIT] [%i"e" ["-" / "+"] 1*DIGIT]

; Reserve additional .keywords for use by future versions of this specification.
reserved-statement = reserved-keyword [s reserved-body] 1*([s] expression)
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18 changes: 9 additions & 9 deletions spec/syntax.md
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Expand Up @@ -699,10 +699,9 @@ Any _unquoted_ literal MAY be _quoted_.
Implementations MUST NOT distinguish between _quoted_ and _unquoted_ literals
that have the same sequence of code points.

_Unquoted_ literals have a much more restricted range that
is intentionally close to the XML's [Nmtoken](https://www.w3.org/TR/xml/#NT-Nmtoken),
with the restriction that it MUST NOT start with `-` or `:`,
as those would conflict with _function_ start characters.
_Unquoted_ literals can contain a _name_ or consist of a _number-literal_.
A _number-literal_ uses the same syntax as JSON and is intended for the encoding
of number values in _operands_ or _options_, or as _keys_ for _variants_.

```abnf
literal = quoted / unquoted
Expand All @@ -713,9 +712,9 @@ quoted-char = %x0-5B ; omit \
/ %x7D-D7FF ; omit surrogates
/ %xE000-10FFFF

unquoted = unquoted-start *name-char
unquoted-start = name-start / DIGIT / "."
/ %xB7 / %x300-36F / %x203F-2040
unquoted = name
/ number-literal
number-literal = ["-"] (0 / ([1-9] *DIGIT)) ["." 1*DIGIT] [%i"e" ["-" / "+"] 1*DIGIT]
```

### Names and Identifiers
Expand All @@ -732,10 +731,11 @@ _Function_ _identifiers_ are prefixed with `:`, `+`, or `-`.
_Option_ _identifiers_ have no prefix.

A **_<dfn>name</dfn>_** is a character sequence used in an _identifier_
or as the name for for a _variable_.
or as the name for a _variable_
or the value of an _unquoted_ _literal_.

_Variable_ names are prefixed with `$`.
for a _function_ (prefixed with `:`, `+` or `-`),
_Function_ names are prefixed with `:`, `+` or `-`.

Valid content for _names_ is based on <cite>Namespaces in XML 1.0</cite>'s
[NCName](https://www.w3.org/TR/xml-names/#NT-NCName).
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